KRK-RH-series square non-return-valves
KWT non-return-valves are used to prevent backflow in sewer systems, are light weight, easy to install and are very responsive and reliable. Standard 5 MwC backpressure
KWT non-return-valves are used to prevent backflow in sewer systems. KWT flap– and pump valves are made from durable HDPE (density 0,96); open/close is fixed by a bespoke balance weight. The EPDM lip seal is routed in at a 3° angle thus providing a perfect flat seal. All valves except KRK-R-O en KRK-RH-O have an additional angle that provides added sealing in static position and very low in-pipe water levels. HDPE flapvalves are light weight, easy to install and are very responsive and reliable. Onseat pressure is standard 5 MwC; higher pressures on request. Pump valves incorporate both a stroke limiter and an optional release valve in order to limit excess pressure at pump start-up and vacuum at pump shut down. KRK-RH-O & KRK-RH-OH are basic square on -wall flat mounted non return valve.
| Operation | None |
| Opening | Water pressure from the back |
| closing | Water pressure from the front |
| Mechanism | Hinge |
| Expected life span | 25 years |
| Maximum pressure | 5 Meter water column (mWC) <48 hours 1,25 Meter water column (mWC) >48 hours |
| Leakage rate | On seating: DIN 19569-4 : 1995-02 Class 3 |
| Intended use | Sewage- or surface water – gravity fall outlet Not for floodprotection, KRK-RVS is suiteble for this |
| Maintenance | See maintenance manual |
| Strenght calculation method | KWT standard |
| Wall frame and flap | HDPE |
| Reinforcements for flap plate | HDPE |
| Hinge | Stainless steel 316L |
| Seals | EPDM |
| Fixing kit | Chemical anchors or mechanical bolts |
| Bolts and nuts | RVS A4-70 |
